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Proteomic analysis for Type I interferon antagonism of Japanese encephalitis virus NS5 protein

Identifieur interne : 000607 ( Ncbi/Checkpoint ); précédent : 000606; suivant : 000608

Proteomic analysis for Type I interferon antagonism of Japanese encephalitis virus NS5 protein

Auteurs : Tsuey-Ching Yang ; Shih-Wein Li ; Chien-Chen Lai ; Kai-Zen Lu ; Man-Tzu Chiu ; Tsung-Han Hsieh ; Lei Wan ; Cheng-Wen Lin

Source :

RBID : PMC:7167617

Abstract

Japanese encephalitis virus (JEV) nonstructural protein 5 (NS5) exhibits a Type I interferon (IFN) antagonistic function. This study characterizes Type I IFN antagonism mechanism of NS5 protein, using proteomic approach. In human neuroblastoma cells, NS5 expression would suppress IFNβ‐induced responses, for example, expression of IFN‐stimulated genes PKR and OAS as well as STAT1 nuclear translocation and phosphorylation. Proteomic analysis showed JEV NS5 downregulating calreticulin, while upregulating cyclophilin A, HSP 60 and stress‐induced‐phosphoprotein 1. Gene silence of calreticulin raised intracellular Ca2+ levels while inhibiting nuclear translocalization of STAT1 and NFAT‐1 in response to IFNβ, thus, indicating calreticulin downregulation linked with Type I IFN antagonism of JEV NS5 via activation of Ca2+/calicineurin. Calcineurin inhibitor cyclosporin A attenuated NS5‐mediated inhibition of IFNβ‐induced responses, for example, IFN‐sensitive response element driven luciferase, STAT1‐dependent PKR mRNA expression, as well as phosphorylation and nuclear translocation of STAT1. Transfection with calcineurin (vs. control) siRNA enhanced nuclear translocalization of STAT1 and upregulated PKR expression in NS5‐expressing cells in response to IFNβ. Results prove Ca2+, calreticulin, and calcineurin involvement in STAT1‐mediated signaling as well as a key role of JEV NS5 in Type I IFN antagonism. This study offers insights into the molecular mechanism of Type I interferon antagonism by JEV NS5.


Url:
DOI: 10.1002/pmic.201300001
PubMed: 24166946
PubMed Central: 7167617


Affiliations:


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PMC:7167617

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<div type="abstract" xml:lang="en">
<p>Japanese encephalitis virus (
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) nonstructural protein 5 (
<styled-content style="fixed-case" toggle="no">NS</styled-content>
5) exhibits a
<styled-content style="fixed-case" toggle="no">T</styled-content>
ype
<styled-content style="fixed-case" toggle="no">I</styled-content>
interferon (
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
) antagonistic function. This study characterizes Type I
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
antagonism mechanism of
<styled-content style="fixed-case" toggle="no">NS</styled-content>
5 protein, using proteomic approach. In human neuroblastoma cells,
<styled-content style="fixed-case" toggle="no">NS</styled-content>
5 expression would suppress
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
β‐induced responses, for example, expression of
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
‐stimulated genes
<styled-content style="fixed-case" toggle="no">PKR</styled-content>
and
<styled-content style="fixed-case" toggle="no">OAS</styled-content>
as well as
<styled-content style="fixed-case" toggle="no">STAT</styled-content>
1 nuclear translocation and phosphorylation. Proteomic analysis showed
<styled-content style="fixed-case" toggle="no">JEV NS</styled-content>
5 downregulating calreticulin, while upregulating cyclophilin
<styled-content style="fixed-case" toggle="no">A</styled-content>
,
<styled-content style="fixed-case" toggle="no">HSP</styled-content>
60 and stress‐induced‐phosphoprotein 1. Gene silence of calreticulin raised intracellular
<styled-content style="fixed-case" toggle="no">C</styled-content>
a
<sup>2+</sup>
levels while inhibiting nuclear translocalization of
<styled-content style="fixed-case" toggle="no">STAT</styled-content>
1 and
<styled-content style="fixed-case" toggle="no">NFAT</styled-content>
‐1 in response to
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
β, thus, indicating calreticulin downregulation linked with
<styled-content style="fixed-case" toggle="no">T</styled-content>
ype
<styled-content style="fixed-case" toggle="no">I IFN</styled-content>
antagonism of
<styled-content style="fixed-case" toggle="no">JEV NS</styled-content>
5 via activation of Ca
<sup>2+</sup>
/calicineurin. Calcineurin inhibitor cyclosporin A attenuated NS5‐mediated inhibition of
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
β‐induced responses, for example,
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
‐sensitive response element driven luciferase,
<styled-content style="fixed-case" toggle="no">STAT</styled-content>
1‐dependent
<styled-content style="fixed-case" toggle="no">PKR</styled-content>
m
<styled-content style="fixed-case" toggle="no">RNA</styled-content>
expression, as well as phosphorylation and nuclear translocation of
<styled-content style="fixed-case" toggle="no">STAT</styled-content>
1. Transfection with calcineurin (vs. control) si
<styled-content style="fixed-case" toggle="no">RNA</styled-content>
enhanced nuclear translocalization of
<styled-content style="fixed-case" toggle="no">STAT</styled-content>
1 and upregulated
<styled-content style="fixed-case" toggle="no">PKR</styled-content>
expression in
<styled-content style="fixed-case" toggle="no">NS</styled-content>
5‐expressing cells in response to
<styled-content style="fixed-case" toggle="no">IFN</styled-content>
β. Results prove
<styled-content style="fixed-case" toggle="no">C</styled-content>
a
<sup>2+</sup>
, calreticulin, and calcineurin involvement in
<styled-content style="fixed-case" toggle="no">STAT</styled-content>
1‐mediated signaling as well as a key role of
<styled-content style="fixed-case" toggle="no">JEV NS</styled-content>
5 in
<styled-content style="fixed-case" toggle="no">T</styled-content>
ype
<styled-content style="fixed-case" toggle="no">I IFN</styled-content>
antagonism. This study offers insights into the molecular mechanism of
<styled-content style="fixed-case" toggle="no">T</styled-content>
ype
<styled-content style="fixed-case" toggle="no">I</styled-content>
interferon antagonism by
<styled-content style="fixed-case" toggle="no">JEV NS</styled-content>
5.</p>
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<name sortKey="Hsieh, Tsung An" sort="Hsieh, Tsung An" uniqKey="Hsieh T" first="Tsung-Han" last="Hsieh">Tsung-Han Hsieh</name>
<name sortKey="Lai, Chien Hen" sort="Lai, Chien Hen" uniqKey="Lai C" first="Chien-Chen" last="Lai">Chien-Chen Lai</name>
<name sortKey="Li, Shih Ein" sort="Li, Shih Ein" uniqKey="Li S" first="Shih-Wein" last="Li">Shih-Wein Li</name>
<name sortKey="Lin, Cheng En" sort="Lin, Cheng En" uniqKey="Lin C" first="Cheng-Wen" last="Lin">Cheng-Wen Lin</name>
<name sortKey="Lu, Kai En" sort="Lu, Kai En" uniqKey="Lu K" first="Kai-Zen" last="Lu">Kai-Zen Lu</name>
<name sortKey="Wan, Lei" sort="Wan, Lei" uniqKey="Wan L" first="Lei" last="Wan">Lei Wan</name>
<name sortKey="Yang, Tsuey Hing" sort="Yang, Tsuey Hing" uniqKey="Yang T" first="Tsuey-Ching" last="Yang">Tsuey-Ching Yang</name>
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